Two novel Cu4O4 cubanes with functionalized chelating aziridine ligands

The synthesis and molecular structure of [Tetrakis(mu(3)-(2-aziridin-1-yl-ethanolato-kappa N-2,O)-bromidocopper(II)] (5) and [Tetrakis(N-(2-amino-2-methylpropyl)-2,2-dimethylaziridine-kappa N-2,N')-(mu(3)-hydroxido)copper-(II)]tetrabromide (7) is reported. Both chelate complexes are prepared from the corresponding bidentate aziridine ligands 2-(1-aziridinyl)ethanol (3) and N-(2-amino-2-methylpropyl)-2,2-dimethylaziridine (4), respectively and CuBr2 (1) or CuBr (2, by redox reaction), in dry dichloromethane. Both compounds crystallize in a distorted Cu4O4-cubane structure. In the neutral complex 5, the cube is formed by four mu(3)-bridging oxygen atoms of the bidentate 2-aziridin-1-yl-ethanolato ligand formed by deprotonation of 3 and four square-pyramidal Cu(II) centers. In the cationic complex 7, the Cu4O4 core consists of four mu(3)-hydroxido bridges situated at alternate vertexes to four also 5-coordinate Cu(II) centers. Both compounds are fully characterized by IR-spectroscopy, elemental analysis and X-ray structure analysis and describe the first examples of cubanes with aziridine ligands. (C) 2011 Elsevier Ltd. All rights reserved.     «

The synthesis and molecular structure of [Tetrakis(mu(3)-(2-aziridin-1-yl-ethanolato-kappa N-2,O)-bromidocopper(II)] (5) and [Tetrakis(N-(2-amino-2-methylpropyl)-2,2-dimethylaziridine-kappa N-2,N')-(mu(3)-hydroxido)copper-(II)]tetrabromide (7) is reported. Both chelate complexes are prepared from the corresponding bidentate aziridine ligands 2-(1-aziridinyl)ethanol (3) and N-(2-amino-2-methylpropyl)-2,2-dimethylaziridine (4), respectively and CuBr2 (1) or CuBr (2, by redox reaction), in dry dich...     »